Merge pull request #508 from nielspetersen/2.9-stable

Removes left over admin users table view.
Allow picture render size to be flexible in width or height

Before, you had to state render sizes in the format '300x200'.

Now, you can use e.g. '300' for inferring the height from the image file preserving the aspect ratio (or 'x200' for inferring the width).

These two additional ways of specifying the image geometry are provided by the used image processing library Image Magick (and its wrapper dragonfly), see http://www.imagemagick.org/script/command-line-processing.php#geometry.
Merge pull request #513 from zweitag/2.9-flexible-image-geometry

Allow picture render size to be flexible in width or height
correcting 'sitemap' show flag
Updates README
Run build against Ruby 2.0 and 2.1
Raises version.
Reverted version back to beta, bcz. it's not stable yet.

See comments in 2270d2f7743c8c251af662d314e80f42dc4ff444
Include Alchemy::Tasks::Helpers in database import task.
Adds a render_icon helper spec.
Prefix all icon font classes.

We use the icon font classes inside of the menubar stylesheets.
But because we are in the website's domain, we accidentally override icon classes of the website.
This commit fixes this.
Adds more style resets to menubar buttons.
Merge pull request #526 from magiclabs/2.9/namespace-icon-classes

(2.9-stable) Prefix icon font css classes.
Use only ID selector to speed up test

Conflicts:
	spec/features/admin/language_tree_feature_spec.rb
Adds trash feature and unit tests for element